1/2” X 8” bolts without the 4”block, 1/2” X 12” with the 4” block. When I installed these (front and back) I found that the 4” block was too much and no block was too little to get the body of my Ramcharger level. I ended up using a 1 1/2” block and 1/2” X 9 1/2” u- bolts. Hope this helps!
from Redding, CA
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